Make filters use SkImage instead of SkBitmap

src/effects/SkComposeImageFilter.cpp

Index: src/effects/SkComposeImageFilter.cpp
diff --git a/src/effects/SkComposeImageFilter.cpp b/src/effects/SkComposeImageFilter.cpp
index 4a17e152de704d7b0369ea9ba3f2c731632ea0ec..fdebd4e04cbac0a2bb7314beda283a623f9c06e0 100644
--- a/src/effects/SkComposeImageFilter.cpp
+++ b/src/effects/SkComposeImageFilter.cpp
@@ -14,16 +14,16 @@ SkComposeImageFilter::~SkComposeImageFilter() {
 }
 
 bool SkComposeImageFilter::onFilterImage(Proxy* proxy,
-                                         const SkBitmap& src,
+                                         SkImage& src,
                                          const Context& ctx,
-                                         SkBitmap* result,
+                                         SkAutoTUnref<SkImage>& result,
                                          SkIPoint* offset) const {
     SkImageFilter* outer = getInput(0);
     SkImageFilter* inner = getInput(1);
 
-    SkBitmap tmp;
-    return inner->filterImage(proxy, src, ctx, &tmp, offset) &&
-           outer->filterImage(proxy, tmp, ctx, result, offset);
+    SkAutoTUnref<SkImage> tmp;
+    return inner->filterImage(proxy, src, ctx, tmp, offset) &&
+           outer->filterImage(proxy, *tmp, ctx, result, offset);
 }
 
 bool SkComposeImageFilter::onFilterBounds(const SkIRect& src,